Mazda Rotary Club

General => General Technical => Topic started by: Jim_rx7 on April 05, 2007, 05:12:34 PM

Title: Wierd knocking noise... any ideas?
Post by: Jim_rx7 on April 05, 2007, 05:12:34 PM
Ok...

My car sort of bounces a bit at 30pmh in 4th when cold. Someone suggested it could be the diff mounts. (I\'ve still to get this checked out).

I noticed when coming to a standstill sometimes I hear a clunk sound as if something is moving forward and clunking.

Anyone got any ideas? Could it be the diff mounts? Kinda sounds like what calipers sound like if they\'ve stuck and you drive and they pop off (if that makes sense?).

Anyone got any clever ideas?

cheers! :)
Title: Wierd knocking noise... any ideas?
Post by: interloper393 on April 05, 2007, 05:36:32 PM
is it your calipers lol they tend to bind a bit if not used very moocho..
Title: Wierd knocking noise... any ideas?
Post by: Jim_rx7 on April 05, 2007, 06:09:18 PM
I thought that... but not too sure tbh.
Title: Wierd knocking noise... any ideas?
Post by: shaggy on April 05, 2007, 09:59:57 PM
Have you looked under the car. Get it jacked up and poke around a bit. Don\'t forget to axle stand it though!!
Title: Wierd knocking noise... any ideas?
Post by: mikeyh on April 05, 2007, 10:30:13 PM
Quote from: interloper393is it your calipers lol they tend to bind a bit if not used very moocho..
oh did i not tell you that lol
Title: Wierd knocking noise... any ideas?
Post by: TonyC on April 05, 2007, 10:30:44 PM
Sounds like the propshaft joints are worn, but may be diff mounts or similar.
Title: Wierd knocking noise... any ideas?
Post by: Jim_rx7 on April 05, 2007, 10:40:36 PM
Quote from: TonyCSounds like the propshaft joints are worn, but may be diff mounts or similar.

If it us the prop shaft joints, what\'s needed to be done to resolve it?

Diff mounts easy enough fix.
Title: Wierd knocking noise... any ideas?
Post by: Jim_rx7 on April 05, 2007, 10:41:09 PM
Quote from: shaggyHave you looked under the car. Get it jacked up and poke around a bit. Don\'t forget to axle stand it though!!

not yet mate.
Title: Wierd knocking noise... any ideas?
Post by: interloper393 on April 05, 2007, 10:43:55 PM
Quote from: mikeyhoh did i not tell you that lol
No i dont think you did :D
Title: Wierd knocking noise... any ideas?
Post by: mikeyh on April 05, 2007, 10:45:43 PM
o i think i did wen u called about ur car not running right

lol
Title: Wierd knocking noise... any ideas?
Post by: interloper393 on April 05, 2007, 10:47:43 PM
ma wheel fell off tho lol.. well close to it cus of that nasty person in japan :S
Title: Wierd knocking noise... any ideas?
Post by: TonyC on April 06, 2007, 11:31:26 AM
Quote from: Jim_rx7If it us the prop shaft joints, what\'s needed to be done to resolve it?

Diff mounts easy enough fix.

Speaking from other RWD car experience: the prob usually connects to the gearbox output shaft and the diff by two universal joints (I\'[ve not yet looked under the Rx to see exactyl what is under there but it must be someting similar). These UJ\'s do wear and can move in the bearings makeing a knocking noise. Often this is heard when you run really low rvs in a high gear.
usually the fix is pretty easy, undo the bolts hlding the uj to diff and gearbox (depending which end is worn), the remove the Uj from prob, then bolt new one and bingo.
It would bea half hour job on my last car.

when you look underneath check the joints on the prob shat for movement.
Title: Wierd knocking noise... any ideas?
Post by: Jim_rx7 on April 06, 2007, 02:46:24 PM
Cheers mate, will get it looked at soon.
Title: Wierd knocking noise... any ideas?
Post by: Jim_rx7 on August 14, 2007, 07:08:39 PM
How much are these universal joints for the prop shaft? Where can I get them?
Title: Wierd knocking noise... any ideas?
Post by: marky on August 14, 2007, 07:50:47 PM
I\'d be intersested in knowing this to. Mine knocks at low revs and also on down shifts usually from 4th to third when the revs drop

Regards

Mark
Title: Wierd knocking noise... any ideas?
Post by: Evil Twin on August 15, 2007, 08:53:41 PM
Hi
I had a similar problem that caused a clunk noise to be generated from the rear suspension when I pulled up.  Then when pulling away it gave a little clunk as the suspension returned to its running position.  I had the car checked and a couple of the rear bushes had gone.  Once these were replaced the rear end stopped making the noise.


Not sure if this will help, but it might.
Title: Wierd knocking noise... any ideas?
Post by: RedRummy on August 15, 2007, 09:56:32 PM
I had a similar sound coming from the front... turned out it was a front suspension arm coming loose...  tightened up, and all sorted :)
Title: Wierd knocking noise... any ideas?
Post by: Carl on August 15, 2007, 10:17:15 PM
More likely to be bushes in rear suspension,the props do were but not as soon as the bushes.
Regards
Carl